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Comments on Gigapan: Baraboo Syncline/Baraboo Quartzite -- Ableman's Gorge

  2. At Ableman's Gorge, a former quarry, 1.7 billion year old ripple marks form a vertical wall scores of feet high. Stop and think about what that means -- the sand that eventually became this rock was laid down at a time when the only living things on planet were unicellular. And the forces that can stand this up to vert...

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